AIX 5L Problem Determination - IBM Redbooks

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5.2 Starting a system dump A user-initiated dump is different from a dump initiated by an unexpected system halt because the user can designate which dump device to use. When the system halts unexpectedly, a system dump is automatically initiated to the primary dump device. Do not start a system dump if the flashing 888 number shows in your operator panel display. This number indicates that your system has already created a system dump and written the information to your primary dump device. If you start your own dump before copying the information in your dump device, your new dump will overwrite the existing information. You can start a system dump by using one of the methods listed below. If you have the Software Service Aids Package installed, you have access to the sysdumpstart command and can start a dump using one of these methods: ► Use the command line. ► Use SMIT. If you do not have the Software Services Aids Package installed, you must use one of these methods to start a dump: ► Use the Reset button. ► Use special key sequences. 5.2.1 Using the command line To create a system dump, use the following steps to choose a dump device, initiate the system dump, and determine the status of the system dump. Check which dump device is appropriate for your system (the primary or secondary device) by using the following sysdumpdev command: # sysdumpdev -l primary /dev/hd6 secondary /dev/sysdumpnull copy directory /var/adm/ras forced copy flag TRUE always allow dump FALSE dump compression OFF This command lists the current dump devices. You can use the sysdumpdev command to change device assignments. Start the system dump by entering the following sysdumpstart command: # sysdumpstart -p 68 IBM ^ Certification Study Guide - AIX 5L Problem Determination Tools and Techniques
This command starts a system dump on the default primary dump device. You can use the -s flag to specify the secondary dump device. If a code shows in the operator panel display, refer to 5.3, “System dump status check” on page 74, for more information. If the dump was successful, reboot the system. During the boot process, if the forced copy flag is set to TRUE, a menu will be displayed on the primary console requesting the removable media to copy the dump to /dev/rmtx or /dev/fd0. (You are prompted to choose which location.) The size of the dump in /dev/hd6 is also displayed. It is advisable to not use /dev/fd0 for the copy of the dump. Once the copy has been completed, exit the copy screen and the system will continue the boot process. The sysdumpdev -K command will set the force copy flag to true. 5.2.2 Using the SMIT interface Use the following SMIT command to choose a dump device and start the system dump: # smit dump The Choose the Show Current Dump Devices option can be used to note the available dump devices. Select either the primary or secondary dump device to hold your dump information, as shown in Figure 5-1. Figure 5-1 SMIT dump screen Chapter 5. System dumps 69
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ibm.com/redbooks IBM Certification
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Note: Before using this information
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3.5.1 The /etc/inittab file . . . .
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7.2.1 Data relocation . . . . . . .
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9.9.1 The lslicense command . . . .
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x IBM ^ Certification Study Guide -
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10-12 Performance tuning flowchart
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8-7 Commonly used flags of the rout
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Trademarks The following terms are
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This publication does not replace p
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Comments welcome Your comments are
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1.1 Certification requirements To a
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e. Verify that file systems are mou
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Preparation for this exam is the to
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2.1 Defining the problem The first
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If the problem occurs on more than
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2.4.1 Answers The following are the
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3.1 A general overview of the boot
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mainly to components on the motherb
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Page 48 and 49: As mentioned, there are a lot of di
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Page 52 and 53: Figure 3-9 Boot phase 3 /etc/initta
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Page 68 and 69: The most important fields in the pr
Page 70 and 71: Figure 4-1 Main diagnostics menu Th
Page 72 and 73: ► Full testing requires that the
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Page 80 and 81: LED 299 A LED code of 299 shows tha
Page 82 and 83: Figure 4-2 Format of the 103 code m
Page 84 and 85: 4.5 Quiz The following assessment q
Page 86 and 87: 4.5.1 Answers 4.6 Exercises The fol
Page 88 and 89: 5.1 Configuring the dump device Pri
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Page 100 and 101: Setting output device to /dev/rmt0.
Page 102 and 103: Look at the time of the dump and th
Page 104 and 105: Failure Causes SOFTWARE PROGRAM Rec
Page 106 and 107: Using crash, you can examine: ► A
Page 108 and 109: ► ? or help[] Lists all subcomman
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Page 116 and 117: In this example, the VMM return cod
Page 118 and 119: The snap command syntax is as follo
Page 120 and 121: Flag Description -t Format Lists ea
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Page 124 and 125: Figure 5-3 Error log case study 2.
Page 126 and 127: Figure 5-4 Case study Which of the
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Probable Causes ERRDEMON STARTED AU
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To display a detailed report of all
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USER ID 0 0=SOFT IPL 1=HALT 2=TIME
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Resource Class: planar Resource Typ
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Flag Description -k ErrorID[,ErrorI
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6.5.1 Setting up an accounting syst
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6.6 The syslogd daemon The syslogd
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Use the following message priority
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3. A system operator accidentally d
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6.7.1 Answers 6.8 Exercises The fol
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7.1 LVM data The Logical Volume Man
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7.2.1 Data relocation 7.2.2 Backup
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AIX version level Verify that the v
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This example shows that the volume
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This error information displays the
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hdisk0 Available 30-58-00-8,0 16 Bi
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7.4 The AIX JFS 7.4.1 Creating a JF
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7.4.2 Increasing the file system si
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In many cases, restoration of the b
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lv02 jfs 2 2 1 open/syncd /u/testfs
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► Understanding enhanced journale
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512 bytes) to minimize internal fra
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Function JFS2 JFS Compression No Ye
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7.4.10 Disk quota Pseudo file name
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home: blocks in use: 0, limits (sof
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7.5.3 Reducing and removing paging
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Table 7-3 Commonly used flag of the
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7.6.4 The rmlvcopy command The rmlv
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Which of the following commands sho
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8.1 Network interface problems If h
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As you can see, the output shows th
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3. If there is a default route, att
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If you are using the route command
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address of the named server and try
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TOK: access control field = 0, fram
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4. Initiate an iptrace (client, ser
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the nfs_max_threads parameter of th
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Flags Description -s host Records p
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8.6 Quiz Table 8-8 Commonly used fl
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8. Which of the following options w
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9.1 User license problems If it is
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telnet: connect: A remote host did
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9.2.4 Telnet error If when attempti
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user is limited and defined as an A
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9.4.3 A full file system uid=0(root
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9.5.1 Trace hook IDs The events tra
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your trace, the system may be traci
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113 0.004261661 0.001518 unlock: lo
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If the sendmail command encounters
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9.8 Printing Task SMIT fast path Co
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Action or function System V PowerPC
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Switching between subsystems The op
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Flag Description -s Subsystem Speci
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9.10 Quiz Flag Description -O Optio
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6. A user has the ability to ping t
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Figure 10-1 General performance tun
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Display previously captured data Th
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10.1.2 The vmstat command The vmsta
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later). The method used in AIX Vers
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second. Large values indicate a CPU
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kernel routine records the process
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syncd 1 2 2 0 0 0 sh 1 1 1 0 0 0 sl
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The memory columns The memory colum
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The sr column The sr column shows t
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If you want to sort to the sixth co
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► Workload Management Class (-W)
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schedtune limitations The schedtune
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schedtune parameters are reset by t
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Normal files are automatically mapp
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tty: tin tout avg-cpu: % user % sys
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When looking for performance proble
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those that do not. If you are runni
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The netstat -m command The netstat
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spec buf 1 0 0 0 128 128 0 locking
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Late Collision Errors The Late Coll
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The retrans column displays the num
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Figure 10-3 Web-based System Manage
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Superclasses A superclass is a clas
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► Shared subclass: This subclass
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The sequence of attributes within a
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This manual assignment can be done
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This defines three levels of privil
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The class assignment is done by WLM
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Figure 10-8 shows the SMIT panel wh
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Figure 10-10 SMIT panel for rset re
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10.6.1 The dbx command The dbx comm
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Subcommand Description return Conti
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15) phxent_dd [5 entries] 16) kbddd
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10.8 Command summary The following
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10.8.4 The nfsstat command 10.9 Qui
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6. Which command will show system c
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11.1 Overview 11.1.1 Terminology 11
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Note: Before installing a new set o
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► APAR number, such as IY00301. I
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► To install all filesets associa
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Table 11-2 Commonly used flags of t
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11.5 Quiz Flag Description -f Check
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- A Web server The browser must be
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Figure 12-2 HTTP filesets If you ar
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- Remote computer Type the remote d
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Figure 12-4 Documentation Library S
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CISPR International Special Committ
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I/O Input/Output I 2 C Inter Integr
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OEM Original Equipment Manufacturer
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SPM System Performance Measurement
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Other resources These publications
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phase1 figure 23 phase2 15, 24, 36
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pc.statd 189 daemons shdaemon 73 te
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host name resolution telnet login p
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N name resolution diagnostic 185 pr
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ecent CPU usage 241 recovering an i
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System Resource Controller (SRC) 13
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